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Gracefull Apache2 config reload

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Login as root and type the following command
# /etc/init.d/httpd reload
OR
# apachectl -k graceful
This is also known as gracefully restarting the Apache httpd daemon. If the daemon is not running, it is started. This differs from a normal restart in that currently open connections are not aborted. A side effect is that old log files will not be closed immediately. This means that if used in a log rotation script, a substantial delay may be necessary to ensure that the old log files are closed before processing them.

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Persistent connect to additional MySQL in a clever way.

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# create ssh key
ssh-keygen

# copy ssh key to the mysql source server
ssh-copy-id -i ~/.ssh/id_rsa.pub [email protected] -p 2222

# use this to test ssh connection
ssh [email protected] -p 2222

# here we make persistent connection to the source DB by changing DB port
ssh -fNg -L 3307:127.0.0.1:3306 [email protected] -p 2222

# and here we make the connection!
mysql -h 127.0.0.1 -P 3307 -u root -p some_db_on_source_server

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